Linux环境中Web服务器的配置与优化

文章详细讲解了在Linux操作系统中如何配置和优化Web服务器,希望为后续的技术应用奠定坚实基础。     

模拟与数字调制方式的非线性变换识别方法

在多级调制识别系统中,首先需要区分调制方式是模拟调制还是数字调制。本文提出一种非线性变换方法对截获信号序列进行预处理,然后通过提取该序列的差分序列方差作为唯一的分类特征,就可以在较低信躁比条件下有效区分模拟和数字调制方式。这种非线性变换方法简单直接,所用特征少,并易于软件实现,尤其适合软件无线电等实时性要求高的应用领域。     

基于改进的二阶阻容等效电路模型的锂电池建模仿真

为了更加精确地描述锂离子电池的工作特性,在传统二阶Thevenin模型的基础上考虑电池的滞回电压特性与充放电电阻特性,建立改进的二阶阻容等效电路模型。在Matlab/simulink中建立电池仿真模型,通过HPPC实验对电池的参数进行辨识。借助Matlab中的Cftool工具箱对数据进行多项式拟合。之后经过恒流放电实验和脉冲放电实验对模型进行验证分析,通过仿真结果与实验结果的对比分析,发现该模型在恒流放电实验中仿真电压与真实电压的误差低于0.05V,在脉冲放电实验中的误差低于0.025V,验证了改进的锂离子电池模型的准确性,满足工程需要。     

The link between environmental uncertainty,organizational agility,and organizational creativity in the hotel industry

Informed by the confusion theory, this study tests the three main aspects of environmental uncertainty on organizational creativity and extends the moderating model of organizational agility in uncertain environments. The data were collected from 174 managers of five-star hotels. Construct validity and the hypotheses were tested using AMOS 26.0. The findings show that organizational agility moderates the negative impacts of competitive and technological uncertainty on organizational creativity. The results suggest that in highly dynamic and complex environments, organizations must reduce bureaucracy to manage the challenges of uncertainty. Informed by the confusion and contingency theories, this study offers new insights into the relationship between environmental uncertainty, organizational creativity, and organizational agility in the hospitality industry.     

How Does the Stock Market View Bank Regulatory Capital Forbearance Policies?

During the subprime crisis, the Federal Deposit Insurance Corporation (FDIC) has shown, once again, laxity in resolving and closing insolvent institutions. Ronn and Verma (1986) call the tolerance level below which a bank closure is triggered the regulatory policy parameter. We derive a model in which we make this parameter stochastic and bank specific to infer the stock market view of the regulatory capital forbearance value. For 565 U.S. listed banks during 1990 to 2012, the countercyclical forbearance fraction in capital, most substantial in recessions, could represent 17%, on average, of the market valuation of bank equity and could go as high as 100%.     

互联网平台型企业敏捷性发展研究

互联网技术的普及在推动互联网平台型企业快速发展的同时也导致了外部市场环境的剧烈动荡。在这种情况下，发展企业敏捷性，快速应对市场环境变化变得十分重要。本文以LQ为例，采用案例分析的研究方法，识别互联网平台型企业对企业敏捷性的影响因素以及产生的具体影响。通过研究发现，互联网平台型企业的企业架构、企业团队和企业合作对企业敏捷性有积极的促进作用，其中企业团队和企业合作与企业敏捷性存在强相关关系，而企业架构与企业敏捷性存在弱相关关系。本研究发展了企业敏捷性理论和互联网平台型企业理论，可以为互联网平台型企业合理架构平台，规划运营方向，从而提升企业敏捷性提供借鉴。     

The sustainable humanitarian supply chain design: agility,adaptability and alignment

The sustainable humanitarian supply chain (SHSC) has been the subject of research and debate over recent years. The aim of the paper is to provide an SHSC definition, propose an SHSC structure and validate it empirically. A unique contribution of the present study is an attempt to delineate humanitarian supply chain (HSC) management from commercial supply chain management and further discuss the HSC from the point of view of sustainability. We identify three important characteristics of a HSC network: agility, adaptability and alignment, and further explore possible linkages using extant literature and interpretive structural modelling (ISM). We further test the constructs using confirmatory factor analysis. In this way we attempt to answer long-pending calls from past researchers to contribute to the existing theories of HSC and identify further research directions based on the limitations of the present study.     

企业共进化关系模式稳定性、序层次及演化分析

企业共进化的logistics方程组体现了企业间非线性相互作用。本文运用微分方程稳定性分析方法,讨论了企业共进化的稳定类型、受扰运动、对应的参数取值条件及反映的企业间发展关系;系统地揭示了各种关系模式的内在稳定性、相互作用程度和平衡特征;在协同学演化理论基础上提出了企业共进化系统两个层次的序-规模序和关系序,以及它们在演化中的性质和功能。不同涨落引起企业发展的可能相变具有随机性,据此,文章还综合揭示了企业的协同演化机制和相变过程。     

Repeated audit controls

An important task of auditors is to check whether recorded values are correct. From the number (or total) of the errors found in a sample, upper confidence limits for the fraction (or total) of the errors in the population are calculated by standard methods.
Even auditors are human, however, and may make mistakes: errors may remain unnoticed. As administrative rules and regulations are becoming more and more complicated, this kind of auditors' mistakes tends to occur more frequently. Hence, there is an increasing need to check the auditing process itself. This can be achieved by checking a subsample of audited values a second time, now by an error-free supervisor.
This paper investigates the consequences of the (possible) occurrence of errors in this subsample. A simple and analytically attractive model is presented for the number of errors found in this double inspection scheme. Maximum likelihood estimators are derived for the population fraction of errors and the probability of an error remaining unnoticed. Based on that, an exact upper confidence limit for the population fraction of errors is calculated, treating the probability of an unnoticed error as a nuisance parameter. Our method was originally developed during a recent Dutch case study: in a subsample of already audited values one additional error was found by the supervisor. It is shown that, as a consequence, the upper confidence limit is increased very sizeably.